Reverse Claps [japanese urban legend]
In Japan, "clap hands" is considered something good, something that scares the evil and so on. But there is a reverse palm, and it is something you can not do, as they believe this bring the opposite of the conventional palms: it is called the palm of the dead.
There is a story/urban legend about the reverse palms. "A couple was touring haunted places. The man from the relationship was very excited to find some ghost, while his companion was very terrified. After visiting the first place, the young girl was still very scared and no longer wanted to go to the next place, which would be the abandoned house, but he insisted and took her anyway. After this house, the boy invites her to another place, and she unexpectedly accepted, and is all euphoric to go. It amazes the boy, and he picks up the car and they go to the third place. This would be a tunnel, where they say to be haunted and to have people buried by the walls. As they approach the young woman, says she’s exited, she claps her hands with the back of her palms.”